Improvement in work-trimmers for sewing-machines



' H. H. HALLETT. WORK-TRIMMERS FOR SEWING-MACHINES.

No. 191,584, Patented June 5,1877.

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UNITED STATES PATENT @FFIGE;

IMPROVEMENT IN WORK'TRIMMERS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No 191,581, dated June 5,1877; application filed March 6, 1877.

To all whom it may concern:

Be it known that I, HERVEY H. HALLETT, of ltockland, of the county ofPlymouth and State of Massachusetts, have made a new and usefulimprovement in or invention having reference to fork-Trimmers ofSewingMachines; and do hereby declare the same to be fully describedin'the following specification, and represented in the accompanyingdrawings, of which Figure 1 exhibits a front elevation of my improvedwork-trimmer in its arrangement with the needle-bar, the presser-foot,and feeder of a sewing-machine. Fig. 2 is a top view of the carrier andstop of the cutting-lever. Fig. 3 is a back view of the saidcuttinglever. Fig. 4. is a top view of the work-supporting plate,showing the feeder, the needlepassage, and the slot or opening forreceiving the cutting-lever.

My invention consists, first, in an improved work-trimmer, composed of acarrier separate from the work-support plate, and also of a cammedlever-knife, as hereinafter described, pivoted above its cutting-edge tosuch carrier; second, in the combination of an operative spring with thecarrier and cutting-knife, all

being as hereinafter explained; third, in the combination of anadjustable stop with the said carrier and the cammed lever-knife, asexplained; fourth, in thecoinbination of the needle-bar, thepresser-foot, and the feeder of a sewing-machine with the cammedleverknife, substantially in manner as set forth, whereby the needle-baris made to move the the lever-knife back, to cause it to cut into thework, and said knife is moved forward by the work while being fed along.

While the sewing-machine is in operation the work-trimmer trims or cutsthe work close to and parallel to the line of sewing.

In the drawings, A denotes a lever having, at its lower end or part, aknife-edge, a, and over such an incline or cam, b, all being arranged asshown, especially in Fig. 3.

This lever is pivoted to a furcated carrier, 13. This carrier isprovided with a screw, 0, for fastening it to the front end of the gooseneck 0 of a sewing-machine.

A helical spring, D, is fixed to the upper end of the lever A and to apost, (1, extending up from the carrier, as shown.

On the top of the carrier, and arranged with the lever A in manner asrepresented, is the adjustable stop E, which is a plate slottedlengthwise to receive a set-screw, e, which goes through the slot of theplate and is screwed into the carrier.

The lever A, provided with the cutting-edge and cam or incline, asdescribed, is, or should be, arranged with the needle-bar F, thepresser-foot G, and the feeder H of a sewing-machine, in manner asrepresented in Fig. 1, in which case it will be seen that the lower partof the lever extends down through an opening or slot,f, in thework-support plate 9 of the machine. The adjustable stop Eis to preventthe cutting-edge of the lever A from being drawn by the spring D againstthe end of such slot or openingfafter removal of a piece of work fromthe machine. It will be readily seen that, were the cutting-edge allowedto be forced by the spring against the end of the slot, such edge wouldbe liable to be dulled thereby.

The incline or cam of the lever A is to be arranged directly underneaththe lower end of the needle-bar, in order that such end of such bar incourse of its downward movement may be forced against the cam orincline, and thereby be caused to move the lever in a manner to pressthe knife or cutting-edge back into the work, the leverhaving beenprevious ly moved in the opposite direction by the work, while being fedforward by the feeder. The presser-foot, by resting on the work while itmay be in the act of being cut or trimmed by the knife, prevents thework from slipping back under the pressure of the knife against it. Theoperative spring D of the cammed lever serves to keep the cutting-edgethereof in contact with the work, or operates to prevent the lever frombeing accidentally thrown out of the work while the latter may bein theact of being sewed.

I claim as my invention 1. The improved work-trimmer composed of thecarrier B, separate from the work-support plate 9, and the lever Apivoted to such carrier, and provided with the cam or incline b and theknife or cutting-edge a, all being arranged and applied substantially asdescribed.

2. The combination of the operative spring D with the carrier B, andwith the lever A pivoted thereto, and provided with theincline b andcutting-edge a, arranged as set forth.

3. The combination of the adjustable stop E with the carrier B, and thelever A pivoted thereto, and provided with the incline or cam and thecutting-edge, all being substantially as set forth.

4. The combination of the spring D and the adjustable stop E with thecarrier B, and the lever A pivoted to such carrier, and provided withthe cutting-edge and the incline or cam, arranged as set forth.

5. The combination of the needle-bar F, the

HERVEY H. IIDALLETT.

Witnesses It. H. EDDY, J. R. SNOW.

